CO₂ + Temperature & Humidity Sensor

INS-THCO2-V

This CO₂, temperature and humidity three-in-one sensor adopts a high-performance NDIR digital CO₂ sensor with ABC self-calibration and temperature compensation functions. Designed for indoor wall mounting, it accurately measures CO₂ concentration, temperature and relative humidity. Equipped with a large LCD screen for cyclic display of measured parameters, it supports 4‑20mA and 0‑10V analog outputs and is compatible with various automatic control systems. Featuring a service life of over 15 years and maintenance-free operation, it has built-in overvoltage and reverse connection protection and strong anti-interference performance. Its junction-box terminal structure prevents circuit board damage caused by wiring. The flame-retardant PC housing is CE certified for stable and reliable operation, suitable for air quality monitoring in various indoor environments.

Function Overview Specifications Operation and Installation Instructions

Function Overview

A 3-in-1 device for detecting and controlling ambient air quality (CO₂), temperature and humidity;
Suitable for indoor wall mounting;
High-performance NDIR digital sensor and circuit for accurate measurement with temperature compensation;
Multiple high-precision temperature sensors, compatible with various control systems;
Good long-term stability and reliability with fast response speed;
CO₂ sensor service life over 15 years, maintenance-free;
Advanced terminal-on-junction-box structure to protect the circuit board from potential damage during wiring;
Adopts digital technology with overvoltage and reverse connection protection, high reliability and strong anti-interference capability;
Large LCD screen alternately displays CO₂ concentration, temperature and humidity with unit indicators

Specifications

Sensor: NDIR sensor with ABC self-calibration function*
Measuring Principle: Active gas diffusion
Accuracy: (40+3%MV) ppm
Response Time (T90): ＜120s (30cc/min, low airflow)
Drift: ＜±10ppm/year
Range: 0~2000ppm (measuring range 400~2000ppm)
Output: 4~20mA

Temperature

Sensor: Digital or RTD, refer to selection table
Range: 0~50℃
Accuracy: Refer to accuracy table
Output: 4~20mA

Relative Humidity

Sensor: Digital type
Range: 0~100%RH
Accuracy: Refer to accuracy table
Hysteresis: ＜±1%RH
Response Time: ＜10s (25℃, low airflow)
Drift: ＜±0.5%RH/year
Output: 4~20mA, 0~10V
Power Supply: 16~28VAC / 16~35VDC
Output Load: ≤500Ω (current type), ≥2KΩ (voltage type)
Display: LCD digital display
Display Resolution: 1ppm, 0.1℃, 0.1%RH
Operating Environment: 0~50℃, 0~95%RH (non-condensing)
Temperature Compensation: 0~50℃
Storage & Transportation Temperature: -20~60℃
Housing Material: Flame-retardant PC (UL94V-0)
Protection Class: IP30
Weight: 175g
Certification: CE
ABC Self-calibration Function: Automatic Baseline Correction. It continuously monitors and records the minimum sampling values of the sensor over several days, and slowly corrects long-term drift by comparing with the fresh air reference value of 400ppm.

Operation and Installation Instructions

(1) Read all instructions carefully before use.
(2) Maintain a well-ventilated environment.
(3) Protect against moisture, vibration and dust during operation.
(4) Do not expose to rain, other liquids or corrosive gases.
(5) Dry the device promptly if it gets wet or contaminated by liquid.
(6) Contact professional maintenance personnel or our company in case of equipment malfunction.

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